The map message is essentially a set of key-value pairs, which makes it suitable to carry a flattened document, as described in the previous section.
映射消息实际上是一组键值对，这使它适合携带扁平结构的文档，如前文所述。
The map message is essentially a set of key-value pairs, which makes it suitable to carry a flattened document, as described in the previous section.
映射消息实际上是一组键值对，这使它适合携带扁平结构的文档，如前文所述。
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